ANSI/ ASME EXTERNAL Screw Thread Size Chart. All units are in inches. Unified Screw Threads per. ANSI/ASME B1.1-1989 (R2001), R2001) Nomenclature, are used.

ANSI/ ASME INTERNAL Screw Thread Size Chart. All units are in inches. Unified Screw Threads per. ANSI/ASME B1.1-1989 (R2001), R2001) Nomenclature, are used. Acceptability criteria are described in ANSI/ASME B1.3M-1992 (R2001). Note: This screw chart is not comprehensive of all available standard threads as provided by the standard.

There are three classes of external (1A, 2A, and 3A) and internal threads (1B, 2B, and 3B). The characteristics and typical application of each class are as follows: Classes 1A and 1B: These classes are the loosest fit, in that, the largest amount play or clearance in assembly.

ANSI Bolt Thread Sizes You can measure existing bolts with calipers then look up the size. There are also even smaller #00, #000, #0000 bolt sizes that are not listed on this chart. There are also six thread classes. External threads: 1A, 2A, 3A and internal threads: 1B, 2B, 3B

dix 4), Bureau of Standards Miscellaneous Publication No. 89.1 These tables cover the basic sizes, limiting dimensions, tolerances, and tap-drill sizes for the American National coarse and fine thread series. I. American National coarse-thread series Table 1. American National coarse-thread series. Table 15.

Mar 28, 2008 · ANSI/ ASME Screw Thread Size Chart. All units are in inches. Order Online, Receive Fast Shipping For A Range Of High Quality Screws.

ANSI/ASME B1.1 Unified National Thread - UNC Coarse series and UNF Fine series. Unified threads comes in three different classes: UNC threads according ANSI B1.1: Pitch is the distance between screw grooves and is commonly used with inch …

Mar 24, 2025 · The American National Standards Institute (ANSI) sets guidelines for external screw threads, specifying dimensions and tolerances based on thread class (2A and 3A). These standards help engineers and manufacturers maintain consistency, reduce wear, and improve performance across various industrial and commercial uses.

May 16, 2016 · Unified National Coarse Screw Thread per ANSI B1.1 screw thread date chart. The Nominal Major Diameter and Threads-per-inch (Pitch) are defined by ANSI/ASME B1.1 and are the choices for the customary Unified screws and nuts.

This table provides the standard metric external thread sizes ranging from M1.6 to M18, as per ANSI/ASME B1.13M-1995, with all lengths represented in millimeters. Size Pitch